Machine for punching and riveting sheet material



Oct. 2, 1923. 11,469,26E

A. R. HAVENER MACHINE FOR PUNCHING AND RIVETING SHEET MATERIAL Filed Dec. 5, 1922 5 Sheets-Sheet 2 Get. 2, 1923.

A. R. HAVENER MACHINE FOR PUNCHING AND RIVETING SHEET MATERIAL Filed Dec. 5. 1922 5 Sheets-Sheet 5 Oct. 2 1923.

A- R. HAVENER MACHINE FOR PUNCHING AND RIVETING SHEET MATERIAL Filed Dec. 5, 1922 5 Sheets-Sheet 4 \ll Am,

fxvvenborx Oct. 2 1923', l,4@9,261

A. R. HAVENER MACHINE FOR PUNCHING AND RIVETING SHEET MATERIAL Filed Dec. 5. 1922 5 Sheets-Sheet 5 man; 2 .m,

Patented Get. 2, i923.

se ms agnomes rare. col, ii conronnrionon'irassaonnsnmjs,

MACHINE ronruncnxne annnlvn rzne a mn mane.

Application filed December material. It is particularly adapted for,

punching and riveting together comparatively large sheets of material, such as a sheet of metal ands sheet of. fiber. This material when finished being used in cotton mills for transferring cotton and cotton yarn fromv one part of the miltto'the other. These sheets of material are used forthevsidesand ends of the cars, Which are fastened together by suitable means such as angle'ironsand brackets. q

*He'retofore it has been the. custom to. rivet the sheets of metal and the sheets of fiber together in the. following manner 1st. Two sheets of material glued together. g a

"2d. One of the, sheets ismai ked with chalk by means of a templet, the templet having holes therein and being placed on the not of material. which is tohe punched.

3d. Chalkis' then dusted over the surface of the temple't and passing over the holes in the templet leavessmall deposits sof the chalk on the surface of the sheet which is to be punched, in the positions where the rivets are to be driven.

41th, The templet is then removed f-roin' the sheet; the two sheets glued together are then carried to punch; the holes are punched in the sheet Where the small chalk dots appear; and" th. The sheets are then'taken to rivet-' ing machine and riveted,

jhus it will be seen that th manner; Mereover, the holes when punched in this manner have to be located bythe eye,-'th at is, the chalk dotshave to belocated beneath the 1 ch by theeye, and the rivet tobesetfin thehole by positioning the sheet material unwa s the rivet setting instrunie italities. V p

. v v iththemachine ofiny invention: of h s work can he clone accurately and quickly L inone operation. and Without the necess ty navnnnn, on Waiznnnn, EEASSACHfiSETTS, as'sionon TO annsonf n] out in the claims.

five operations necessary to secure the sheetstogether 1n of gluing T the sheets together. 'llhis result is attained by inea'nsof a suitable punching, and "rivet ng ;mach1ne comb ned with the Work suppdrufn mme relatively to the punching and setting ginstrumentalities,

one side'to the othenfor both}, and: the Work support is provided With-oneor more clamps which are mounted on thevrork su apojrtand movable therewith and which c amp "the ,eithei'f forwardly and-hackivardly or from I sheets of'material together and tothe work sup ort. 1 l

T e invention consists in the combination of a punching mechanism or riveting mechanisnnxor both punching and rivetingjmechr anis1n,-'vvith a Worksupport, upon which is mounted clamping means, the Work. support together with the clamping means being movable rela-tively to the. punching mocha nism or'riveting mechanism, and punching "proved. Work support hereinafter set forth in the specification andfparticularlypointed Referring tojthe drawingszf Figure 1 is a front elevation of my improved punching and riveting machine, certain partsbeing' broken avvay to save space in the drawing. Q 1 i Fig; 2 is a side elevation ofthe same as viewed from the right of Figured, also brokenaway. 1 p l Fig. 3 is a sectional plan taken on line 8'3 of Fig. 2, particularly illustrating the Work support. J I

i g. l is a sectional elevation taken on the line i t, Figure 1. r Y j v iFig. 5 is a'sectional elevationtaken on the l-iiie 55, Figure 1.

Fig.6 is a plan view of, one of the clamps andaportion of the work support-upon which it is mounted.

. and riveting mechanism, as the case may be.

Fig. Sis a frOntEelevati n.partly in seca tionthrou h the unchi'ne'and rivetin' int: o I:

the punching and rivetingtakes place. U r

. a front elevation similar te-Fi thereby While the punching;

sm'imentalities, showing theqparts; in therelosite'nsi f 5' a "upper arm'13 upon whichthe punching thereto upon which is a 1 connecting rod 29 is pivotally V-mounted 30 upon the crankpin 28 at oneend and at Like numerals refer to like partsthroughout the several views of the drawings.

In the drawings, lO is the frame. of the machine supported upon the column. .11.

and base 12. The frame consists of an and riveting mechanisms are mounted and of another arm 14 upon thefront'end of which the punch block and anvil are sup- 7. 10 ported, ,together with a portionofthe work support. Punching amd fioetiag linstmmentalities.

The punching and riveting instrument-al- 15 ities are both driven from a main driving shaft 15 which has a pinion 16 fast thereto meshing into a gear 17 which is loosely.

mounted upon a shaft 18 but which can be 7 docked thereto in'a manner well known to 2 those skilled in' the art by a clutch 19 operated by means of a clutch lever 20, link 21, lever 22,.link 23 and treadle 24 pivoted at '25 to the rear of the'column '11, the treadle being moved upwardly by means of 25 a spring 26 and downwardly by the foot of the operator. I

The shaft 18 has a face plate 27 fast crank pin 28. A

its other end is connected by a pin 30 to a lever 31 pivoted at'32 to the frame of the machine and having an arm 33 thereon with a rounded end 34' which projects into a 35 I sliding block 35 slidably mounted in a vertical slide 36 whereby a reciprocat'ory movement- -1s imparted to said slide 36. The slide 36 is the main slide and operates two auxiliary slides, namely, the rivet slide 37 and 40 the punch slide 38. The rivet slide 37 may be locked to the main slide 36, when so desired, by means of a bell crank lever 39, pivoted at 40 within the rivet slide 37 and having an arm' 41 thereon which has a rounded end projecting into a locking-pin :42 slidably mounted in the rivet slide 37 and adapted to be moved into a recess 43 n the main slide 36, or into a recess 44 in a cap 45 fast to the frame of the machine.

Thus the lever 39 may be operated to lock the rivet slide 37 tolth'e main slide 36, whereupon a reciprocatory movement will be imparted to said rivet slide, or the rivet 7 'slide may be unlocked from the mainslide. 36 and-locked to the cap 45 whenit is.de-,

sired to hold the 'same'in a stationary posi- Qtion. A rivet driver 46 is fastened to the lowere'ndfof therivet slide 37 and coacts i with a: rivetcarrier 47 to feedand .drive IlTJQtS through the mater al and clinch them againstjan anvil 48 ,in a manner well known to those skilled .in this art. The anvil 48.

is supported upon the arm 14. The rivet] carrier or pocket 47 18 made intwo parts and is carried by a rivet carrier slide 49,

which is pushed downwardly by the rivet carrier slide 47 and driver 46 and is carried upwardly by a spring 50. The punch slide- 38 may be locked to the main slide 36 in a manner similar to that hereinbefore described, whereby the rivet slide is locked to the main slide. 7

Referring to Fig. 5, a bell crank lever 51 is pivoted at 52 to the punch slide 38 and has an arm'53'thereon with arounded end 54 projecting into a locking pin 55 which can be operated by said lever 51 to enter a recess 56 in the slide 36, or to enter a recess 57 in. a can 45 fast to the frame of.

the machine; ,The locking pins 42 and 55 are of such a length that they may be positioned entirely within the slides37 and 38.

respectively and not project intolthe'recesses 43 and44, or 56 and 57, and at such a time the said slides 37 and 38 are held stationary by spring actuated friction plugs 59 and 60 respectively. The slide 38is held in its upward position when the'locking pin is being shifted by a spring 38, the lower end of which is connected to a pin 39 which is fast to the slide 38 and engages the arm 13, thus forming a stop to limit the upward movement ofthe punch SllFlG.' i hen the plug 42 is in its midway position the slide 37 may be lowered to bringthe driver 46 into contact with the sheet material to position the same, or the punching slide 38 to-bring the punch 61 punch during the upward movement of the same, a stripper 65 is provided through whichthe punch projects, said stripper being fastened to a slide 66'mounted to slide in ways in the front end of the arm. 13.

The said slide is pushed downwardly by the punch slide 38 and is carried upwardly by aspring 67, one end of-which is fastened to a st-ationary pin 68 fasttoa stationary cap 45 and the lower end of 'which is connected to a bell crank lever 69 pivoted to a: bracket 69' fast to the slide66. The bell crank lever 69 when in the position illustrated in Fig. 4 limits the distance to which the stripper can move upwardly sufficiently to allow space: for the sheet material to be fed during the several punchingand riveting operations. 'lVhem'hofwever, it is de sired to insert the sheet material in the machine or to remove it therefrom, the lever 69 is operated to allow the stripper to move upwardly to the position illustrated in Figs.

meager 1 and 2 by tipping the bell crank lever 69 downwardly and allowing the spring '67 to pull the slide 66 and the "punch stripper with it upwardly so as togive greater space between the stripper and the punch block for inserting the material to be punched and riveted, or for removing the same from the machine after it is punched and riveted.

Rivets are supplied to the rivet carrier 47 from; a'hopper 70, Figs. land 2, the mov able member of which is driven by a belt 71 and by a pulley 72 on ets pass down the raceway 7 3 and are fed to the carrier in a manner well known to those skilled in the art. I

A' work support 7 4, upon which material is placed and positioned relatively to the punching and rivet setting instrumentalities', comprises an upper slid'able member 75 and a lower slida-b-le member 7 6. The upper slidable member is slidable forwardly and backwardly on the machine between the arms 13 and 14: and upon the lower slidable member 76, and the lowerslidable member is slidable from one side to the other ofthe machine between the arms 13- and 14: the two members 75 and 76together forming the complete work support 74:. The lower slidable member 7 6 consists of a' pair of parallel rods 77 extending forwardly and backwardly of the gether byfiat strips 7S and 79.

' strip 7 8 is fastened at its oppositeends to the rod (1 by so that the lower'member 7 60f the'wor'k supoort comprises. a rectangular frame consist- 81. This lower slidable member 76. of the 7 work support is supported at its front end by a roll 82 journalled-upon a bracket 83 fast to the strip 78 and mounted to roll upon a bracket 84 fast to the arm 14. The-brackets 81 are U shaped'in form and between the legs ofthe Us are mounted guide rolls 85 and 86 which engage a stationary -rod..87 eX- tending transversely of and fast to the frame 10.

The upper slidable member 75 of the work supportconsists of a rectangular frame formed of fiat strips 88 and 89 extending. transversely of the frame 10 and fastened I to strips 90. and 91 fast thereto and extending longitudinally of the arms 13 and 1 1.

atrium s'triis 92 and .93 extendin aoa V n L proximately parallel to the strips and .91

form in effect a portion of the upperv slidable member 7 5.- The upper slidable member 7 5 is slidably mounted uponrthe rods 77 of the lower. slidable member 7611);; means of inverted L shaped brackets 94, 95, 9G and 917. The brackets 9%,95and 96 are alike and each has' rotatably mounted thereon a guide roll'lS and these rolls are mounted to roll the shaft 18'. The rivmachine and joined to The flat brackets 80' and the flat strip 7 9 is fastened to the rods 77 bybrackets 81,"

t ofthe twoend rods 77 the front strip. the rear strip 79 and the brackets 80v and upon the rods 77. The bracket 97, see Figs.

8 and 9, is also U shaped andhas a roll 99 rotatably mounted thereon. The bracket 97 hasthe opposite legs 100 thereofip rojecting,

downwardly on opposite sides of therods7 7 at the right of. the machineand a screw 101 having screwthreaded engagement with one of sald legs is adapted to clampthe two legs 100 againstopposite s des of said rod 77 to fix the upper slidable meinber iti of the v work support in a stationary positionrela means of a bellcrankleverflO pivoted at 101 to a bracket 1 05 fast to said arm" 14:. A

rod 106 connects said bell crank lever toa treadle 107 pivoted to a bracket 108 on the \5 base 12 and a spring 109 draws thetreadle 107 and rod 106 upwardly to tip the-bell cranklever108 in the proper direction to move the locking pin 102 toward the right,

Fig. 2 and intoany one of a series of holes 110 provided in the strip 78. Thus it will'be seenthat the upper slidab'le member 75and the lower slidable member 7615f the work support may be positioned independently of each other relatively to thepunchin and rivet setting instrumentalities and loo-lied. in

position. v; q The work r n thrs particular instancecon- 'sisting of a sheet o f material 111 andfa sheet of material 112 to iastn d iqgethefby nvets' These two Shee fma erlal are placed upon the upper slidable member of the work supportaasillustrated infFi'gs. 8 and 9, the left hand sides of said sheets of material resting upon the strip 92, the right hand sides resting. upon the strip 93. The right hand edges abut against gauges forming a part of clamps 113, two of which are provided and each ofwhich consists of the following instrumentalities bracket llt has a horizontal base plate 115 which is fastened by screws 116 to the underside of the strip 91 a-nd has avertical'fiange117 thereonto which an adjustable framellS is fastened by means of screws 119 and 120 which project through a slot 121 provided in'the vertical flange'117 of the bracket 114:.

The frame'118 consists of a horizontalb ase platef122 and two parallel vertical fianges123 spaced apart from each other to receive a'clamping'lev'er 12st which ispjivote bv means of "a pin 12.5 tothe verticalflanges 1,23. A clamp -screw -126'hasscrew-threaded engagement with the rear-endi'of theolanip- 1 lever124randits lower'endbears against "125 the plate 122' oftheframe' 11581; The, jw ooden s'tripfi93; iscut out to receive a portion'of the ba'se 128 and as will .be seen by re'ference tolligs 6 and 7 the-right' hanidedges of the pieces of sheeflinaterial 111 iand'112 rest against the front edges- 12'? of tlie x Q tical flanges 123. lt will be ev' lcnt there- 7 fore, that the vertical flanges 123 forming a part of the frame 118 constitute gauges to Y 7 7 determine the distance of the r ght hand edges of the sheet material from the punchmg and rivetsettinginstrumentalities when 7 i v iv the material is first placed upon the acid support. This initial distance oi the right hand edges of the sheet material may be yaried by adjusting the frame 118 toward 7 the right or left by loosening the screws 119 and 120 and sliding the frame-118 together withthe clamping'lev'er 12% toward the right or left as may be desired and then tightening said screws. The distance to which this adjustment may be carried may be inci'eased'by entirely removing one of the i screws 119 or 120. 1 v

The general operation 01 the'mechanism hereinbefore specifically described is as l ol-- lows :'Assuming the parts" to be in the rela tive positions illustratedm Figs 1 and 2, the two sheets of material 111 and112 are placed upon the upper 'slidable member ?5' of the work support with the right hand edges thereof bearing against the edges 12! of the vertical flanges 123 of the frame 118 These two sheets of material are then clamped to the base122 of the tramellS by 'means of clamping levers 121 and clamp screws 126. A mar: is made uponthe sheet of material 111 for the. first hole to be punched and the-upper slidable member of the work support is moved forwardly or backwardly, andtie lower slidable member 76 or the work support is-moved siden'ise until the mark is brought beneath and-in alignment with the punch 61, whereupon the upper slidable member 75 is locked to the lower slidable member 76 by tightening the screw 101 which clamps the legs 100 ct the bracket 97 to the rod 7?,Figs. 8 and '9.

The upper slidable member '45 and the lower slidable member 76 of the work support are now locked together and are moved bodily together untilthe locking pm 102 drops into the first hole 110 of the series of holes 110. While moving the work support as a whole toward the left or-'right, the locking pin 102 is kept out of engagement-with any of the holes 110 in the strip 78 by the treadle 107, link 106 and lever 103, thelever being depressed by the operator and when 'itis desired to lock the work supportrigidly in 7 position'by means ofthe locking pin 102,

.mentalities by moving the bell "crank lever 51 downwardly 'until'the locking pin is disengaged from the slide 36 and is out of engagement withthe cap 15. lhe punch'61 its slide 38 can then be moved down: war ly'until the-punch is in close proximity to the upper surface ofthe sheet 111 and thus the sheets canbe very accurately positioned for punching the first hole.

The rivet slide 3'? is locked to the cap as by moving the bell crank lever downwar ly from the position shown in Fig. 4 until the locking pin 4-2 enters the recess 1 1. .lh'e operator having.positioned the sheets as hereinbe'lore described releases'the slide 3 l and allows it to move upwardly un til-tho pin 39 engages the arm 13,-andthe bell crank lever is thenoperated to lock the main slide 36 to the punch. slide 38 by means the locking pin Theoperator then depresses the treadle 2&,-which oper-' ates as hereinbeiore described; to throw the clutch int operation and thus rotate the shaft 18 which through the link 29 will opcrate the lever 31 t impart a reciprocatory motion to the main slide436. The slide 86 will first move downwardly carryingwithit the slide 38 and during its downward movement wil engage the stripper and carry itdownwardly tothe position illustrated in Fig. 9, that is, in engagement with'the up per surface of the shee 111. The punch will the same time perforate the two sheets or material/111 and-112; Upon the upward movement of the punch slide 38,-the V punchwill b'e withdrawn lromithe sheet m terial and willpass upwardly into'the-stripper 65 and thusthe material willbe stripped .oil of the punch. 'The'stri pper will only 'moveupwardly a shortdistance to the position illustrated in Fig. 8', further upward movement of the stripper and stripper slide being bell e ik lever 69 engagingthe lower sile the plate 45. The operator releases the treadle 24L soon after depressing it and the clutch is automatically thrown out at the end or" one. rotation of the shaft 18 in a manner well known to those skilled in the art, and the different instrumentalities then come to a stop with the'punching andrriveting instrumentalitiesv in the relative positions illustrated in Figs. 1 and8;

evented by the vertical arm, or the 'J'lhe operator now disengages the locking pin102 from the stri 78 by lowering the" T r tread'le 107 and moves the work support as a whole toward the'right until the hole which has just been punched in the sheet material is brought into alignment with therivet driver 16. .lle then throws the bell crank lever 39 upwardly'to lock the mainslide 36 t1 the rivet slide 3'? as illustrated in-Fig. 4.

lle then lowers the treadle 2 1 to operate the punching and .rlvet instrumentali- -'ties, as hereinbefope described, the punch punching "a new hole and the rivet driver 16 driving a rivet through the hole previously punched in the sheet material, and clinching the same against the anvil 48, the punch and rivet driver and coacting parts all being shown in Fig. 9 as the new hole is being punched and the new punching and rivet settinginstruinentalities then move upwardly to the relative positions illustrated in Fig. 8 and the operator hav ing meanwhile released thetreadle 24, the

machine' comes to a stop." He then moves. the work support toward the right again ing theclamp screw 101 to allow the'upper slidable member to bemoved forwardly a distance equal to the distancebetween the two rows of rivetstobe set, then looking the upper slidablemember 75 to the lower slidable member 7 6 bymeans of the clamp screw 7 101 and then proceeding with the punching and rivet setting 'insti'umentalities, as hereinbefore described. c f v :v When all of the rivets have been set in the sheets of material, the stripper 65 is released by lowering the bell c-ranklever 69 to disengage the vertical arm thereof from the cap 45, whereupon the spring .67 will movethe stripper upwardly from the position illustrated inFig. 8 to the position illustrated in Figure '1 and the work can then be easily removed from the -machine. 1 The strips92 and 93, it will be under stood, rest upon the strips 88 and 89 of the upper member 75 and the strip 92'can be moved longitudinally of the strips 88 and 89 to any position desired, the samebeing recessed on its under-side at its opposite ends to form shoulders, which bear againstthe inner edges of the strips 88 and 89 and thus the strip 92 is positioned on said strips by frictional engagement of saidshoulders wlth said strips. bear against the left handv edges of said sheets 111 and 112 when the right hand edges of said sheets'bear against the strip 93 and the strip 92 can be adjusted as hereinbefore described to accommodate sheets of diiierent lengths.

In the mechanism hereinbefore described the work support is moved to space the holes and the rivets in one line by the operator, who'moves the work support transversely of the driver and punch and longitudinally of the stationary rod 87 and strip 78 by hand. If it is desired to perform this feeding op-' rivet beingsetl The been set in one line extending transverselyot the'arms13 The strip 92 is positioned to eration or movement of the 'work support transversely of'the punch and rivet driver and longitudinally of'the rod "87 and strip 78 automatically, it can bedone by means. of mechanism illustrated in Figs. 1'. 2,3 and 4 and consisting of a weight 127 which has acord 128 fast thereto and extendingu'p wardly therefrom over a pulley 129 'rota- I tably mounted on the frame of the machine,

said cord being fastened at itsupper end to an eye 130 which is'fastenedto one of the brackets to'whioh the strip 78 is fastened,

thus the weight 127 is connected tothelower member 76 of the work support 74 and its ward the right, Figure 1, when the same is released by the locking pin 102 being removed from one of the holes in the strip 78.

"Ashereinbefore' described, this release oi the locking pin was accomplished by means v of the treadle 107, link 106 and lever 103. In the'automatic releasing of the work supportfthis is accomplished bymeans oi: an

arm 131which is fastened to the pivotal shaft 104 of the bell crank lever 103. arm 131 is provided with asegmental sl'ot 132 through which a pin 133'extends, said pin being slidable in the slot 132 and fastened to a link 134 which at itsrear'end'is connected to a lever 135. The upper arm of the lever 135 is connected by a link 136 to a cam lever 137 pivoted at1 38 to the frame of the machine, The arm 139 of the cam lever 137has'a cam roll 140 journalled thereon anden'gaging the periphery of the disc 27 which has a projection 141 thereon adapt ed to intermittently engage thecain roll140' androck the levers 137 and 13 5 to move the rod 134 inthe'direction of the arrow Lb, Fig.

' 2; This will impart a rockingjmovem ent to the ar n131' and through the pivotal pin 104 the bell 'crankllever 103 will be rocked to with;

draw the pin 102 from one of the holes 110,

'tlius releasing lower portion of the work supporta'nd allowing the weight 127 to operate to move said work support toward the right, FigIlJ gThe pin 102- willbe immee diately released as soon as the cam projedton 141 releases the roll 140 and the spring 109 will then operate the bell crank lever 103 to push the locking pin 102 into another one of the holes 110 as: soon as it is brought into alignment with said locking pin by the weight 127. In order to keep the roll 140 in contact with the periphery of the disc 27 a spring 143 is provided, see Fig. 2, which is connected atone end to a pin, 144 fast to the arm 14 and at the otherend to a pin 145 on a I collar 146 which is fastened to the rod 134.

The general. operation of the mechanism for automatically moving the work support is as'follows :-As the shaft 18 is rotated by the mechanism-lhereinbefore described, the

cam projection 141 will engage the roll 140 tendency is to feed said work support to L A work support will then be moved toward the right,,Figure 1, as hereinbefore described, and will then be locked in position by the locking pin 102 vwhich is released asherein before described when the cam projection 141 is fast to the roll 14:0, and the locking pin 102 being thus released is forced into the next hole 110 in the strip 78 by the spring'109, link 106 and bell cranklever 103.

I claim '1. An1achine for punching sheet material having, in combination, punching insrtu mentalities including a punch, a stripper for said punch, a work support movable relatively to said punch and means mounted on said work support and movable therewith to clamp a plurality ofsheets of material together and tosaidwork. support, a slide to which. said punch is fastened,.a slide to which said stripper is rigidly fastened, mechanism adapted to impart a reciprocatory motion to said punch slide, said punch slide being adapted to engage the stripper slide and impart a downward movement thereto and a spring connected to said stripper slide whereby an upward movement is imparted to said stripper. r c

2.. A machine .for punching sheet material having, in combination, punching. instrumentalities including a punch, a stripper for said'punch, a work support. movable relatively to said punch and means mounted on said work support and movable therewith to clamp a plurality of, sheets of material together and to said work support, a slide to which said punch is fastened, a slide upon wh ch said strlpper 1s mounted, mechanlsm adapted to impart a reclprocatory' motion to said punch slide, said punch'slide' being adapted to engage the stripper slide and impart a downward movement thereto, a bell crank lever pivotally mounted on said stripper slide, a stationary member and a spring connecting said bell crank lever to said sta tionaryinember and'a stop adapted to be engaged by said bellcrank lever whereby the upward movement of said slide and stripper said frame whereby said lever may be tipped to perform the clamping operation. 7

4. A machlne, for punching sheet mater al havlng, 1n comblnatlon, punch ng 1nstrumentalities including a punch, a work support movable relatively to said punch and means mounted on said work support and movable therewith to clamp a. plurality of sheets of materialtogether and to said worksupport and embodying a bracket fast to said work support, a frame adju'stably] engagement with said lever and engaging impart a reciprocatory motion to said punch and to said driver and means to disengage either said punch or said vdriver'from said mechanism, a work support movable rela-' tively to said punch and driver and means mounted on said work support and movable therewith to clamp a plurality of sheets of material together and to said worksupport. In testimony whereof I have hereunto set my hand in presence of two subscribing wit- ARTHUR R. HAVENER. VVitnesses: f

FRANKLIN E. LOW,

HAZEL FLA MUDGE.

nesses. 

